Lab-Grown Diamonds
IGI-certified lab-grown diamonds from 4.5 mm to 10 mm, in round, oval, pear and emerald shapes. Verify the certificate online before you buy.
72 diamonds found
Small loose lab-grown diamonds — sold per stone
Small stones from 2.5 mm up, D–E–F color, VVS clarity, for setting rings, making earrings or adding accents. No individual grading report, priced per stone — from 210.000đ/stone.
Lab-Grown Diamonds by Size — 4.5, 5.4, 6.3, 8.1 mm
In Vietnam, round diamonds are often sold by diameter rather than carat — "ly" is the local word for millimetre, so a "4ly5" stone is 4.5 mm across and a "6ly3" is 6.3 mm. Carat measures weight; diameter is the size you actually see on the hand, and two stones of the same carat can differ slightly in diameter depending on the cut. The table below converts diameter to carat for the sizes Thảo Linh currently has in stock.
| Size (Vietnamese "ly") | Diameter (mm) | Carat (~ approx.) | Shop |
|---|---|---|---|
| 4 ly 5 | 4.5 mm | ~0.35 ct | View 5 × 4.5 mm → |
| 5 ly | 5.0 mm | ~0.50 ct | View 1 × 5.0 mm → |
| 5 ly 4 | 5.4 mm | ~0.65 ct | View 2 × 5.4 mm → |
| 6 ly | 6.0 mm | ~0.80 ct | View 2 × 6.0 mm → |
| 6 ly 3 | 6.3 mm | ~0.90 ct | View 10 × 6.3 mm → |
| 6 ly 8 | 6.8 mm | ~1.20 ct | View 6 × 6.8 mm → |
| 7 ly 2 | 7.2 mm | ~1.40 ct | View 3 × 7.2 mm → |
| 8 ly 1 | 8.1 mm | ~2.00 ct | View 3 × 8.1 mm → |
| 8 ly 6 | 8.6 mm | ~2.40 ct | View 3 × 8.6 mm → |
| 9 ly | 9.0 mm | ~2.75 ct | View 3 × 9.0 mm → |
| 10 ly | 10.0 mm | ~3.50 ct | View 3 × 10.0 mm → |
| 10 ly 1 | 10.1 mm | ~3.60 ct | View 2 × 10.1 mm → |
| 12 ly | 12.0 mm | ~6.00 ct | View 1 × 12.0 mm → |
Carat values are approximate conversions for a standard round brilliant cut. Each stone's exact carat weight and price are shown on its IGI report and product page.
Carat
The weight of the diamond. 1 carat = 0.2 grams. Higher carat, higher value.
Color
Graded from D (most colorless) to Z. Lab-grown diamonds are usually a beautiful D–H.
Clarity
How free the stone is of inclusions. FL/IF are the cleanest; VVS1–VVS2 are the most popular.
Cut
Cut decides how much a diamond sparkles. Excellent is the top grade, returning the most light.
What is a lab-grown diamond?
A lab-grown diamond is created in a laboratory with advanced HPHT and CVD technology, with physical, chemical and optical properties identical to a natural diamond. It costs 60–70% less than a natural diamond of the same grading, so the same budget buys a larger, finer stone.
Frequently asked questions
Thảo Linh's consultants are here to help
Contact us now and we'll help you choose the perfect lab-grown diamond.